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Old 30th December 2013, 12:04 AM   #1
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Unhappy /Kicker zx1500.1 Protection LED Flickers

I checked out all other threads, (that's how I've gotten as far as I have) but, I sure could stand a schematic of this beast. Found 3 output Fets almost shorted,(aka hand grenades & Horseshoes) which I pulled and got relay to click. Didn't have any thing like this so, I pulled one of the good outputs from the good side,(even double checked it with my fluke) and placed were the leaky Fets were. It got rostie no time flat while good side stayed cool to touch. Drivers out of circuit seemed fine so am I looking at a digital driver bad or what?
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Old 30th December 2013, 12:47 AM   #2
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The schematics are not available for proprietary reasons. I work in the electronic repair department at Kicker and I've worked on many of these amps.The protection LED toggling is a sign that the output FETs are shorted or there is a problem in the Class D circuit or driver stages. After you pulled out the shorted FET's did you ohm out the location where the FET's were? You should see 47 Kohm from Gate to Source leads(outside to outside pin locator), and all other checks gate to drain and source to drain(middle to either outside pin locator) should be in the megohms. What model year is this? Should be a date stamped on board and the 06 will have red rubber seals on the cover and there are four chips under the daughter board which is the two driver circuits one each for banks of three output FETs. The 08 or newer have these chips closer to the output FET's.
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Old 30th December 2013, 12:54 AM   #3
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What output FET's are in this board, the outputs where replaced with IXTQ36N30's. I believe the original FET's were IRFP264N, but don't hold my feet to the fire! You can pull out the Class D daughter board and preamp/xover board. If the amp is still toggling in and out of protection you can left up D7,this should allow you to check the main and small power supply among other things.
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Old 31st December 2013, 01:56 PM   #4
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Sorry for the time lag..Answer to your 1st question, No, but Good idea. This will be my 2nd thing I'll do, (the first will be to figure out Q 24-27's driver Polarity NPN-PNP?"long story". 2nd question It's a June/10th/08 model.3rd,IXTQ36N30's and the protection stayed off when the shorted finials were pulled. Thanks for your input. Work'n on something this sophisticated without any documentation,( except the simi's themselves) is like that TV show where folks are in a pitch-black room trying to figure out what the heck there grabbing a hold of! This monster is NOT a class A/B,(Or A,B,or G).D's I thought were more like a DAC or a Horizontal output on a CRT,a square waveform amplified to a transformer turned into a sine wave. I don't think I've heard a full bandwidth class D amp, (don't see how they'd sound all that good)
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Old 31st December 2013, 03:25 PM   #5
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when I get a chance I will respond.
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Old 3rd January 2014, 12:27 AM   #6
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this is a class D sub channel mono block, not fullrange stereo. Basically the LM361is a comparator, whichs samples audio referenced to a triangle wave. The results modulate the pulse (PWM). this gets passed through the drivers, ouput mosfets and the output inductor acts as a d to a convertor. hences audio to spkrs. Q24,27 Is 2SD667 npn & Q25, 26 is 2SB647 pnp.
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Old 3rd January 2014, 12:35 AM   #7
ultra is offline ultra  Greece
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Is it possible to replace the IXYS fets with IRFP264?
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Old 3rd January 2014, 02:03 AM   #8
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I'm not sure. the original devices on the ZX1000.1 are replaced with IRFP264N. I will look into it.
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Old 3rd January 2014, 04:04 AM   #9
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Thank You for the Brain Pick! Yes a comparator,( still the output is just a facsimile of the input signal, right?). I still remember some electronic Theory,(ELI the ICE man,the resistor color code saying), but have found out over the years that Murphy's law and not Ohms seems to prevail. The output drivers threw me,JE 171 &181? When I was look'n for output fets, a tech at Newark said FCB36N60NTM (MOSFET, N CH, 600V, 0.081OHM, 36A, TO-263-3) would sub for
IXTQ36N30's which I didn't find right-off. Thanks again, I will reinstall the bipolars and check DC voltages,(again). Hope to find out what fried the originals.
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Old 3rd January 2014, 05:24 PM   #10
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the MJE171 and 181 are good substitute s we used for awhile.either one will work. Did the mosfets in PS blow out. Q24-Q27 are the drivers.
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